Art of welding tubes.



J. C. MOON. ART 0F WELDING TUBES,

APPLICATION mw Nov.27. |916..

Patented June 12, 19N.

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To all whom z't may concern.'

Be it known that l, JOHN C. MOON, a citizen of the United States, residing at the city of St. Louis, State of Missourl, have invented a certain new and useful Improvement in the Art of Welding Tubes, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains, to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a cross sectional view of a sheared section of sheet metal which forms the blank from which my improved tubing is made.

Fi 2 is a cross sectional view showing the ished blank curled into cylindrical form and in readiness to be welded according to my present improvement. a

Fig. 3 is a conventional top plan view of my improved method of preparing the edges of the blank which is to be curled and' welded. Y

Fig. 4.- 4is a conventional illustration of the manner of welding the blank after the same has been curled or bent into cylindrical form. f

' This invention relates to a new and useful method of preparing blanks for welded tubing, the obj ect being to produce a product in the form of a welded tube in which the interior surface or bore is smooth, i. e., a tube in which there are no protuberances resulting from the feathered edges incident to the action of the shears in producin the Hat blank. Heretofore the practice has een to shear the Hat blank from a sheet of metal, and to curl or bend the same before edecting a welding operation. This shearing operation produces feathered edges which in the welding actionform lumps or protuberances on the inner surface of the n- Y automobiles, the leather cup cannot make close contact with the interior surface of the cylinder at all times, and consequently, by-passes are formed which render the pump inecient. lt is impractical to ream out the bore of such pump cylinders, so it is highly desirable to form them as nearly perfect as possible so as to render the reaming operation unnecessary. As the shearingv operation in producing the dat blank from which the tube is formed is responsible for the production of the feathered edges which producethe irregularities in the interior surface or bore of the tube, it is the object. of my invention to get rid of these in the early operations of forming the tube. ln the drawings, 1 indicates the dat blank as it is sheared in the usual way, and on the edges l of which l have shown, in ,an exaggerated manner, feathered edges incident to the shearing operation necessary in the production of the blank.

lMy invention consists in removing the feathers or burs and at the same time beveling the edges Of the flat blank which result is accomplished by the use of grinding wheels preferably made of emery or carborundum, and which may be given a vertical action to sweep 'thev entire edge of the blank, if desired, and these wheels are preferably adjustable toward and from the edge of the blank bymany suitable mechanism. l

ln the drawings, two grinding wheels are shown as being mounted on suitable driven shafts 3. l are adjusting screws mounted in stationary bearings 5. These grinding'wheels not ,only remove the feathered edges produced by the shears, but are so adjusted relative to the blank that they preferably produce a slight bevel `which enables the meeting 1edges of the curvedv blank to come more closely together, as shown in lFig. 2, so that when the tube is welded the heat from the welding jets can properly enter the space between the edges to effect the welding action. @f course., the edges of the dat blank can be 'so beveled that they will practically be parallel when the blank is curved andbe forced to close together. But this may not be desirable, as it wouldprevent the welding jets from entering between and properly heating the surfaces to Vbe welded. According to my invention, it is not necessary, under proper conditionsto swage the welded tube, but it peolcation of Letters Patent. Pmtmljlgdl Juju@ 11% jljll., application met november at, wie. serial no. raam.

will be understood that if such swaging action is desired, the saine may be done Without in the least departing from the nature and spirit of my invention. lt is obvious that instead of using the acetylene burners for effecting the Weldin operation other methods of Welding may be employed, such as by electricity, etc.

What I claim is:

l. The hereindescribed art of pre aring flat metal blanksv Which are to be orrned into Welded tubes which consists in simultaneously beveling and removing the feathers or burs from the edges of the blank before it is curled to bring said edges together.

2. The hereindescribed method .of preparing tubes to be welded consisting in beveling the edges of a section of sheet metal, and then bending' said section of metal to bring the beveled edges together to form a substantially ll-shaped open seam along which the Welding operation is e'eoted.

In testimony whereof l hereunto a my signature in the presence of two Witnesses, this 24th day of November, 1916.

JUHN C. MOON. 

